55051820 has 12 divisors (see below), whose sum is σ = 115608864. Its totient is φ = 22020720.

The previous prime is 55051817. The next prime is 55051879. The reversal of 55051820 is 2815055.

It is a self number, because there is not a number n which added to its sum of digits gives 55051820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376276 + ... + 1376315.

It is an arithmetic number, because the mean of its divisors is an integer number (9634072).

Almost surely, 2^55051820 is an apocalyptic number.

It is an amenable number.

55051820 is an abundant number, since it is smaller than the sum of its proper divisors (60557044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55051820 is a wasteful number, since it uses less digits than its factorization.

55051820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752600 (or 2752598 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 55051820 is about 7419.6913682444. The cubic root of 55051820 is about 380.4146443412.

Adding to 55051820 its reverse (2815055), we get a palindrome (57866875).

The spelling of 55051820 in words is "fifty-five million, fifty-one thousand, eight hundred twenty".